complex_safereturns the safe range of complex floating-point arithmetic.
For full information please refer to the NAG Library document for x02an
The safe range of complex floating-point arithmetic.
complex_safeis defined to be the smallest positive model number such that for any in the range  the following can be computed without undue loss of accuracy, overflow, underflow or other error:
where is any of , , , , , , and is the square root of .